28945911621 has 8 divisors (see below), whose sum is σ = 42103144224. Its totient is φ = 17542976720.

The previous prime is 28945911619. The next prime is 28945911637. The reversal of 28945911621 is 12611954982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28945911621 - 2¹ = 28945911619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28945911671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 438574386 + ... + 438574451.

It is an arithmetic number, because the mean of its divisors is an integer number (5262893028).

Almost surely, 2^28945911621 is an apocalyptic number.

It is an amenable number.

28945911621 is a deficient number, since it is larger than the sum of its proper divisors (13157232603).

28945911621 is a wasteful number, since it uses less digits than its factorization.

28945911621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877148851.

The product of its digits is 311040, while the sum is 48.

The spelling of 28945911621 in words is "twenty-eight billion, nine hundred forty-five million, nine hundred eleven thousand, six hundred twenty-one".